YOU SAID:

My god! What have they done to this place?

INTO JAPANESE

おやまあ！彼らはこの場所に何を行っていますか?

BACK INTO ENGLISH

Oh my god! What they are doing in this place?

INTO JAPANESE

おやまあ！彼らはこの場所でやっているか。

BACK INTO ENGLISH

Oh my god! What are they doing in this place.

INTO JAPANESE

おやまあ！彼らはこの場所で何をしています。

BACK INTO ENGLISH

Oh my god! What are they doing in this place.